The primary cause of these disasters is just that the river picked up a large amount of silt when flowing through the Loess Plateau in its middle __________________.

After being dug out and removed the silt on it, Fuling would be placed until it ( ). A: air-dried B: kiln-dried C: Infrared dried D: fahan

The river flows quietly in its upper reaches, however, in its middle reaches it splits the Loess ___________in half. Therefore, it carries a large amount of silt into the lower reaches.

Which of the following best describes the formation of “desert pavement”? A: alluvial fans are eroded to form inselbergs with flat, angular rocky surfaces B: runoff and deflation carry off the fine particles of silt and clay, leaving coarser particles behind C: groundwater in an alluvial fan evaporates, leaving behind a surface layer of hard-baked mud and boulders D: deflation removes the coarse fragments leaving behind a layer of fine sediment (loess and mud)

The Blue Nile rises in the Mountains of Ethiopia, where seasonal rains cause the annual floods that inundate the Nile Valley with water and silt. A: 埃塞俄比亚的山脉，每逢雨季，山洪暴发，大量的洪水和泥沙淹没尼罗河河谷，蓝尼罗河起源于此。 B: 蓝尼罗河发源于埃塞俄比亚的群山之中，雨季引发每年 一度的洪水并将大量河水和泥土带入尼罗河河谷。 C: 蓝尼罗河发源于埃塞俄比亚的群山之中，那里每逢雨季，山洪暴发，大量的雨水和泥沙注入尼罗河河谷。